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Finding the Fourth Proportional to 811.03, 1,215.28 and 551.16

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Solution

The fourth proportional to 811.03, 1,215.28 and 551.16 is: 825.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.03 : 1,215.28 = 551.16 : x
  2. Step 2: Convert to fraction form
    811.03/1,215.28 = 551.16/x
  3. Step 3: Cross multiply
    811.03x = 1,215.28 × 551.16
  4. Step 4: Simplify right side
    811.03x = 669,813.72
  5. Step 5: Solve for x
    x = 669,813.72/811.03
  6. Step 6: Final answer
    x = 825.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.